Title: wp-admin/widgets.php custom_HTML block errors Last modified: July 27, 2021 --- # wp-admin/widgets.php custom_HTML block errors * [dlin04](https://wordpress.org/support/users/dlin04/) * (@dlin04) * [4 years, 10 months ago](https://wordpress.org/support/topic/wp-admin-widgets-php-custom_html-block-errors/) * After upgrading to 5.8, when I try to modify my widgets, I encounter errors on the Appearance > Widgets page concerning my custom html block. This occurs when I disable all of my plugins as well. * `The "custom_html" block was affected by errors and may not function properly. Check the developer tools for more details.` * Appears three times on the UI. These errors show up three times in the developer console. * ``` api-fetch.min.js?ver…a093f9f92520a98df:2 POST https://REPLACED/wp-json/wp/v2/widget-types/custom_html/encode?_locale=user 418 _ @ api-fetch.min.js?ver…a093f9f92520a98df:2 f @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 b @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 a @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 b.method.r @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 a @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 t @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 y @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ edit-widgets.min.js?…fef25865f0e87b861:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 P @ api-fetch.min.js?ver…a093f9f92520a98df:2 C @ widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 loadContent @ widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 _ @ widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 (anonymous) @ widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 Bh @ react-dom.min.js?ver=16.13.1:126 Dj @ react-dom.min.js?ver=16.13.1:162 unstable_runWithPriority @ react.min.js?ver=16.13.1:25 Da @ react-dom.min.js?ver=16.13.1:60 xb @ react-dom.min.js?ver=16.13.1:162 (anonymous) @ react-dom.min.js?ver=16.13.1:162 U @ react.min.js?ver=16.13.1:16 B.port1.onmessage @ react.min.js?ver=16.13.1:24 ``` * ``` widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 {code: "invalid_json", message: "The response is not a valid JSON response."} code: "invalid_json" message: "The response is not a valid JSON response." Prototype: Object constructor: ƒ Object() hasOwnProperty: ƒ hasOwnProperty() isPrototypeOf: ƒ isPrototypeOf() propertyIsEnumerable: ƒ propertyIsEnumerable() toLocaleString: ƒ toLocaleString() toString: ƒ toString() valueOf: ƒ valueOf() __defineGetter__: ƒ __defineGetter__() __defineSetter__: ƒ __defineSetter__() __lookupGetter__: ƒ __lookupGetter__() __lookupSetter__: ƒ __lookupSetter__() get __proto__: ƒ __proto__() set __proto__: ƒ __proto__() onError @ widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 loadContent @ widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 async function (async) loadContent @ widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 _ @ widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 (anonymous) @ widgets.min.js?ver=2…d3f54ca6175d7c7d9:2 Bh @ react-dom.min.js?ver=16.13.1:126 Dj @ react-dom.min.js?ver=16.13.1:162 unstable_runWithPriority @ react.min.js?ver=16.13.1:25 Da @ react-dom.min.js?ver=16.13.1:60 xb @ react-dom.min.js?ver=16.13.1:162 (anonymous) @ react-dom.min.js?ver=16.13.1:162 U @ react.min.js?ver=16.13.1:16 B.port1.onmessage @ react.min.js?ver=16.13.1:24 ``` Viewing 4 replies - 1 through 4 (of 4 total) * [Tara King](https://wordpress.org/support/users/sparklingrobots/) * (@sparklingrobots) * [4 years, 10 months ago](https://wordpress.org/support/topic/wp-admin-widgets-php-custom_html-block-errors/#post-14732074) * Hi, [@dlin04](https://wordpress.org/support/users/dlin04/)! * I just tested this out on a fresh install of WordPress 5.8. I was able to set up a new Custom HTML block as a widget without encountering this error. * I saw that you disabled all plugins, which is a great start toward debugging. Try setting your site to one of the default (Twenty*) themes and give it another try — it may be a conflict with your specific theme. * Thread Starter [dlin04](https://wordpress.org/support/users/dlin04/) * (@dlin04) * [4 years, 10 months ago](https://wordpress.org/support/topic/wp-admin-widgets-php-custom_html-block-errors/#post-14732194) * Hello. I had previously managed to use the theme customizer to remove the legacy Custom HTML widget and replace it with the Custom HTML block widget. * However, after disabling all plugins again and activating the Twenty Twenty theme, when I attempt to edit my widgets (Appearance > Widgets) I am unable to Update( save) my edits. * The message: “There was an error. The response is not a valid JSON response.” appears in the lower left. * Please note that if I remove the Custom HTML block, the widgets Updates (saves) normally. * api-fetch.min.js?ver…a093f9f92520a98df:2 POST [https://REPLACEME/wp-json/batch/v1?_locale=user](https://REPLACEME/wp-json/batch/v1?_locale=user) 418 _ @ api-fetch.min.js?ver…a093f9f92520a98df:2 f @ api-fetch.min.js?ver…a093f9f92520a98df: 2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 b @ api-fetch.min.js? ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df: 2 a @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js? ver…a093f9f92520a98df:2 b.method.r @ api-fetch.min.js?ver…a093f9f92520a98df:2( anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch. min.js?ver…a093f9f92520a98df:2 a @ api-fetch.min.js?ver…a093f9f92520a98df:2 ( anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch. min.js?ver…a093f9f92520a98df:2 t @ api-fetch.min.js?ver…a093f9f92520a98df:2 ( anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 y @ api-fetch.min.js?ver… a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 (anonymous) @ api-fetch.min.js?ver… a093f9f92520a98df:2 (anonymous) @ edit-widgets.min.js?…fef25865f0e87b861:2 (anonymous) @ api-fetch.min.js?ver…a093f9f92520a98df:2 P @ api-fetch.min.js?ver…a093f9f92520a98df: 2 T @ core-data.min.js?ver…eb531dcf64543c5b7:2 run @ core-data.min.js?ver…eb531dcf64543c5b7: 2 async function (async) run @ core-data.min.js?ver…eb531dcf64543c5b7:2 G @ core- data.min.js?ver…eb531dcf64543c5b7:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf: 2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux- routine.min.js…c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf: 2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 c @ redux-routine.min. js…c977063e356eb95cf:2 t @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js… c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ data.min.js?ver=7bfa…e459d5ec92d30fdda:2 (anonymous) @ data.min.js?ver=7bfa… e459d5ec92d30fdda:2 (anonymous) @ data.min.js?ver=7bfa…e459d5ec92d30fdda:2 (anonymous) @ edit-widgets.min.js?…fef25865f0e87b861:2 (anonymous) @ redux-routine.min.js… c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js… c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf: 2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 Promise.then (async)( anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine. min.js…c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js… c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js… c977063e356eb95cf:2 Promise.then (async) (anonymous) @ redux-routine.min.js…c977063e356eb95cf: 2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 r @ redux-routine.min. js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2( anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine. min.js…c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 Promise.then (async) (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf: 2 r @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min. js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2( anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 r @ redux-routine.min.js… c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js… c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js… c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js… c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf: 2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux- routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf: 2 r @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min. js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2( anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 r @ redux-routine.min.js… c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js… c977063e356eb95cf:2 r @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 c @ redux-routine.min.js…c977063e356eb95cf: 2 t @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min. js…c977063e356eb95cf:2 (anonymous) @ redux-routine.min.js…c977063e356eb95cf:2( anonymous) @ redux-routine.min.js…c977063e356eb95cf:2 (anonymous) @ data.min. js?ver=7bfa…e459d5ec92d30fdda:2 (anonymous) @ data.min.js?ver=7bfa…e459d5ec92d30fdda: 2 (anonymous) @ data.min.js?ver=7bfa…e459d5ec92d30fdda:2 ki @ react-dom.min.js? ver=16.13.1:176 ji @ react-dom.min.js?ver=16.13.1:13 mi @ react-dom.min.js?ver =16.13.1:13 lf @ react-dom.min.js?ver=16.13.1:13 wi @ react-dom.min.js?ver=16.13.1: 187 Kd @ react-dom.min.js?ver=16.13.1:32 pc @ react-dom.min.js?ver=16.13.1:32 Wf @ react-dom.min.js?ver=16.13.1:34 (anonymous) @ react-dom.min.js?ver=16.13.1: 236 uf @ react-dom.min.js?ver=16.13.1:15 Qd @ react-dom.min.js?ver=16.13.1:42 sc @ react-dom.min.js?ver=16.13.1:41 unstable_runWithPriority @ react.min.js? ver=16.13.1:25 Da @ react-dom.min.js?ver=16.13.1:60 mk.Events.current @ react- dom.min.js?ver=16.13.1:236 Ei @ react-dom.min.js?ver=16.13.1:41 - This reply was modified 4 years, 10 months ago by [dlin04](https://wordpress.org/support/users/dlin04/). - This reply was modified 4 years, 10 months ago by [dlin04](https://wordpress.org/support/users/dlin04/). * Thread Starter [dlin04](https://wordpress.org/support/users/dlin04/) * (@dlin04) * [4 years, 10 months ago](https://wordpress.org/support/topic/wp-admin-widgets-php-custom_html-block-errors/#post-14736316) * same issue, false alarm. - This reply was modified 4 years, 10 months ago by [dlin04](https://wordpress.org/support/users/dlin04/). * Thread Starter [dlin04](https://wordpress.org/support/users/dlin04/) * (@dlin04) * [4 years, 9 months ago](https://wordpress.org/support/topic/wp-admin-widgets-php-custom_html-block-errors/#post-14786590) * After some troubleshooting, I’ve narrowed down the issue. * I can save my widgets when I have a custom HTML block, but not if I include the following code in the custom html block: * `` * When trying to ‘Update’ widgets: There was an error. The response is not a valid JSON response. Viewing 4 replies - 1 through 4 (of 4 total) The topic ‘wp-admin/widgets.php custom_HTML block errors’ is closed to new replies. ## Tags * [5.8](https://wordpress.org/support/topic-tag/5-8/) * [custom html](https://wordpress.org/support/topic-tag/custom-html/) * [widget](https://wordpress.org/support/topic-tag/widget/) * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/) * 4 replies * 2 participants * Last reply from: [dlin04](https://wordpress.org/support/users/dlin04/) * Last activity: [4 years, 9 months ago](https://wordpress.org/support/topic/wp-admin-widgets-php-custom_html-block-errors/#post-14786590) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics